. >> i believe there is maybe one city that looks better than us on paper, this is new york city, but truthly they don't have enough inspectors for their housing stock either. >> reporter: which means they could be an unwelcomed surprise under any mattress. >> after we first aired our story the san francisco board of supervisors approved an ordinance that requires exterminators to report to the department of health the number of units that they treated and lance corporals have to tell prospective units if the unit were infected in the past two years if asked. as for hotels they are not obligated to tell their guests. >>> ktvu's mike mic ktvu mike mibach with our next story. >> reporter: locked and loaded, radios on. target city on this night. >> we'll search the residents. >> reporter: san leandro. >> initial contact is the most dangerous. slide around to the left. >> reporter: special agents from the california department of justice are on the hunt. >> it appears nobody is home at this time. >> reporter: but they keep moving. towards a door from day into night, looking for a number o